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Bacteria surround their cytoplasmic membrane with an essential, stress‐bearing peptidoglycan (PG) layer consisting of glycan chains linked by short peptides into a mesh‐like structure. Growing and dividing cells expand their PG layer using inner‐membrane anchored PG synthases, including Penicillin‐binding proteins (PBPs), which participate in dynamic protein complexes to facilitate cell wall growth...
In Mycobacterium tuberculosis and ampicillin‐resistant mutants of Enterococcus faecium, the classical target of β‐lactam antibiotics is bypassed by l,d‐transpeptidases that form unusual 3 → 3 peptidoglycan cross‐links. β‐lactams of the carbapenem class, such as ertapenem, are mimics of the acyl donor substrate and inactivate l,d‐transpeptidases by acylation of their catalytic cysteine. We have blocked...
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